xbyak/readme.md

Xbyak 2.992 ; JIT assembler for x86(IA32), x64(AMD64, x86-64) by C++

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Abstract

This is a header file which enables dynamically to assemble x86(IA32), x64(AMD64, x86-64) mnemonic.

Feature

header file only you can use Xbyak's functions at once if xbyak.h is included.

Supported Instructions Sets

MMX/MMX2/SSE/SSE2/SSE3/SSSE3/SSE4/FPU(partial)/AVX

Supported OS

• Windows Xp, Vista, Windows 7(32bit, 64bit)
• Linux(32bit, 64bit)
• Intel Mac ready

Supported Compilers

• Visual Studio C++ 2005 Express Ed., VC2008 Pro, VC2010
• gcc 4.5
• mingw 3.4.2
• icc 7.2

Note: "-fno-operator-names" option is required on gcc to avoid analyzing "and", "or", etc. as operators.

Install

The following files are necessary. Please add the path to your compile directories.

• xbyak.h
• xbyak_bin2hex.h
• xbyak_mnemonic.h

Linux:

make install

These files are copied into /usr/local/include/xbyak

Syntax

Make Xbyak::CodeGenerator and make the class method and get the function pointer by calling cgetCode() and casting the return value.

NASM              Xbyak
mov eax, ebx  --> mov(eax, ebx);
inc ecx           inc(ecx);
ret           --> ret();

Addressing

(ptr|dword|word|byte) [base + index * (1|2|4|8) + displacement]
                      [rip + 32bit disp] ; x64 only

NASM                   Xbyak
mov eax, [ebx+ecx] --> mov (eax, ptr[ebx+ecx]);
test byte [esp], 4 --> test (byte [esp], 4);

you can use ptr for almost memory access unless you specify the size of memory.

dword, word and byte are class members, then don't use dword as unsigned int, for example.

AVX

You can omit a destination for almost 3-op mnemonics.

vaddps(xmm1, xmm2, xmm3); // xmm1 <- xmm2 + xmm3
vaddps(xmm2, xmm3); // xmm2 <- xmm2 + xmm3
vaddps(xmm2, xmm3, ptr [rax]); // use ptr to access memory

Label

L("L1");
  jmp ("L1");

  jmp ("L2");
  ...
  a few mnemonics(8-bit displacement jmp)
  ...
L("L2");

  jmp ("L3", T_NEAR);
  ...
  a lot of mnemonics(32-bit displacement jmp)
  ...
L("L3");

Call hasUndefinedLabel() to verify your code has no undefined label.

1. support @@, @f, @b like MASM

L("@@"); // <A>
  jmp("@b"); // jmp to <A>
  jmp("@f"); // jmp to <B>
L("@@"); // <B>
  jmp("@b"); // jmp to <B>

2. localization of label by calling inLocalLabel(), outLocallabel()

void func1()
{
    inLocalLabel();
  L(".lp"); // <A>
    ...
    jmp(".lp"); // jmpt to <A>
    outLocalLabel();
}

void func2()
{
  L(".lp"); // <B>
    func1();
    jmp(".lp"); // jmp to <B>
}

Code size

The default max code size is 2048 bytes. Please set it in constructor of CodeGenerator() if you want to use large size.

class Quantize : public Xbyak::CodeGenerator {
public:
  Quantize()
    : CodeGenerator(8192)
  {
  }
  ...
};

See main.cpp

Macro

• XBYAK32 is defined on 32bit.
• XBYAK64 is defined on 64bit.
• XBYAK64_WIN is defined on 64bit Windows
• XBYAK64_GCC is defined on 64bit gcc

Sample

• test0.cpp ; tiny sample of Xbyak(x86, x64)
• quantize.cpp ; JIT optimized quantization by fast division(x86 only)
• calc.cpp ; assemble and estimate a given polynomial(x86, x64)
• bf.cpp ; JIT brainfuck(x86, x64)

Remark

The current version does not support 3D Now!, 80bit FPU load/store and some special mnemonics. Please mail to me if necessary.

License

modified new BSD License http://www.opensource.org/licenses/bsd-license.php

History

• 2011/Feb/10 ver 2.992 beta support one argument syntax for fadd like nasm
• 2011/Feb/07 ver 2.991 beta fix pextrw reg, xmm, imm(Thanks to Gabest)
• 2011/Feb/04 ver 2.99 beta support AVX
• 2010/Dec/08 ver 2.31 fix ptr [rip + 32bit offset], support rdtscp
• 2010/Oct/19 ver 2.30 support pclmulqdq, aesdec, aesdeclast, aesenc, aesenclast, aesimc, aeskeygenassist
• 2010/Jun/07 ver 2.29 fix call()
• 2010/Jun/17 ver 2.28 move some member functions to public
• 2010/Jun/01 ver 2.27 support encoding of mov(reg64, imm) like yasm(not nasm)
• 2010/May/24 ver 2.26 fix sub(rsp, 1000)
• 2010/Apr/26 ver 2.25 add jc/jnc(I forgot to implement them...)
• 2010/Apr/16 ver 2.24 change the prototype of rewrite() method
• 2010/Apr/15 ver 2.23 fix align() and xbyak_util.h for Mac
• 2010/Feb/16 ver 2.22 fix inLocalLabel()/outLocalLabel()
• 2009/Dec/09 ver 2.21 support cygwin(gcc 4.3.2)
• 2009/Nov/28 support a part of FPU
• 2009/Jun/25 fix mov(qword[rax], imm); (thanks to Martin)
• 2009/Mar/10 fix redundant REX.W prefix on jmp/call reg64
• 2009/Feb/24 add movq reg64, mmx/xmm; movq mmx/xmm, reg64
• 2009/Feb/13 movd(xmm7, dword[eax]) drops 0x66 prefix (thanks to Gabest)
• 2008/Dec/30 fix call in short relative address(thanks to kato san)
• 2008/Sep/18 support @@, @f, @b and localization of label(thanks to nobu-q san)
• 2008/Sep/18 support ptr [rip + 32bit offset] (thanks to Dango-Chu san)
• 2008/Jun/03 fix align(). mov(ptr[eax],1) throws ERR_MEM_SIZE_IS_NOT_SPECIFIED.
• 2008/Jun/02 support memory interface allocated by user
• 2008/May/26 fix protect() to avoid invalid setting(thanks to shinichiro_h san)
• 2008/Apr/30 add cmpxchg16b, cdqe
• 2008/Apr/29 support x64
• 2008/Apr/14 code refactoring
• 2008/Mar/12 add bsr/bsf
• 2008/Feb/14 fix output of sub eax, 1234 (thanks to Robert)
• 2007/Nov/5 support lock, xadd, xchg
• 2007/Nov/2 support SSSE3/SSE4 (thanks to Dango-Chu san)
• 2007/Feb/4 fix the bug that exception doesn't occur under the condition which the offset of jmp mnemonic without T_NEAR is over 127.
• 2007/Jan/21 fix the bug to create address like [disp] select smaller representation for mov (eax|ax|al, [disp])
• 2007/Jan/4 first version

Author

MITSUNARI Shigeo(herumi at nifty dot com)

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Revision: 1.2 Date: 2011/02/10 01:24:14